timer revert delay

Function

The timer revert delay command sets the revertive switching delay of an E-Trunk.

The undo timer revert delay command restores the default revertive switching delay of an E-Trunk.

By default, the revertive switching delay of an E-Trunk is 120 seconds.

Only the S5720-EI, S5720-HI, S5720I-SI, S5720S-SI, S5720-SI, S5735-S, S5735S-S, S5735-S-I, S5730-HI, S5730S-EI, S5730-SI, S5731-H, S5731-S, S5731S-H, S5731S-S, S5732-H, S6720-EI, S6720-HI, S6720-LI, S6720S-EI, S6720S-LI, S6720S-SI, S6720-SI, S6730-H, S6730S-H, S6730-S, and S6730S-S support this command.

Format

timer revert delay delay-value

undo timer revert delay

Parameters

Parameter	Description	Value
delay-value	Specifies the revertive switching delay of an E-Trunk.	The value is an integer that ranges from 0 to 3600, in seconds.

Views

E-Trunk view

Default Level

2: Configuration level

Usage Guidelines

Usage Scenario

When the member Eth-Trunk on the master device goes Down, the member Eth-Trunk on the remote device becomes Up after LACP negotiation. Then the remote device becomes the master device, and the local device becomes the backup device. When the local device recovers, it becomes the master device again in the subsequent LACP negotiation.

If an E-Trunk works with other services, after the master device recovers from a fault, the status of the member Eth-Trunk on the master device may be restored before other services are restored. If traffic is immediately switched back to the master device, service traffic will be interrupted. To solve this problem, you need to set the revertive switching delay for the E-Trunk.

After you run the timer revert delay command to set the revertive switching delay for an E-Trunk, the local Eth-Trunk can become Up only after the delay timer times out. This delays the revertive switching of the service traffic, ensuring nonstop services.

Precautions

The revert delay of an E-Trunk must be greater than the PW recovery time. This ensures that services are not interrupted when traffic is reverted back to the master device.

In E-Trunk B2B scenarios where there are four PE devices and an E-Trunk is configured between each two PEs, to ensure that services can be switched back to the master device when a failure recoveries, configure the master device in one E-Trunk to immediately switch traffic back and the master device in the other E-Trunk to switch traffic back after a delay.

Example

# Set the revertive switching delay of E-Trunk 1 to 100 seconds.

<HUAWEI> system-view
[HUAWEI] e-trunk 1
[HUAWEI-e-trunk-1] timer revert delay 100